Keyboard



FIG. 1 is a perspective view of keyboard showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a left view thereof; and,

FIG. 7 is a right view thereof.

Broken lines shown in the drawings are for environment only and form no part of the claimed design. 

CLAIM The ornamental design for keyboard, as shown and described. 